Dark Sensor ( light sensor / automatic street light )
Here is my new simple Electronics project about Automatic Street Light Control System or Dark Sensor.

it is a simple and powerful concept , which uses transistor ( BC 547 NPN) as a switch to switch ON and OFF the street light system automatically .
It automatically switches ON lights when the sunlight goes below the visible region of our eyes. ( e.g in evening after Sunset ).

it automatically switches OFF lights when Sunlight fall on it ( e.g in morning ) , by using a sensor called LDR (Light Dependent Resistor) which senses the light just like our eyes.

Needs no manual operation for switching ON and OFF...

Step 1: Things you need...

Dark Sensor ( light sensor / automatic street light )
Dark Sensor ( light sensor / automatic street light )
Dark Sensor ( light sensor / automatic street light )
Dark Sensor ( light sensor / automatic street light )
Dark Sensor ( light sensor / automatic street light )
Dark Sensor ( light sensor / automatic street light )
Dark Sensor ( light sensor / automatic street light )
Show All 7 Items
Parts:-

* 1 BC547 transistor
* 1 220 k resistor
* 1 330 ohms resistor
* 1 LED (any colour )
* 1 9v battery
* 1 battery clip
* 1 LDR ( light dependent resistor )

Step 2: AND...

Dark Sensor ( light sensor / automatic street light )
* Connecting wires
* soldering rod and wire
* wire stripper
* Cutter

Step 3: Circuit diagram

Dark Sensor ( light sensor / automatic street light )
solder the transistor on the board and solder one wire of the LDR to the emitter and other to the base , solder the negative wire of the LED to the base of the transistor with a 330 ohms resistor and also solder 220k resistor with the one side of the 330 ohms resistor .






Step 4: Finsih... Uuuhuuuu... :p

Dark Sensor ( light sensor / automatic street light )
The simple circuit is ready for testing now . Connect 9v battery terminals to the circuit as show in fig and see the output . As you block light falling on Light dependent resistor (LDR), the LED glows .


 
 

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